CN108058083B - Battery pack and electric tool - Google Patents

Battery pack and electric tool Download PDF

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Publication number
CN108058083B
CN108058083B CN201710982520.0A CN201710982520A CN108058083B CN 108058083 B CN108058083 B CN 108058083B CN 201710982520 A CN201710982520 A CN 201710982520A CN 108058083 B CN108058083 B CN 108058083B
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CN
China
Prior art keywords
tool
air
battery pack
fan
shell
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Application number
CN201710982520.0A
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Chinese (zh)
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CN108058083A (en
Inventor
邱栋荣
陈伟鹏
邹爱龙
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Nanjing Chervon Industry Co Ltd
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Nanjing Chervon Industry Co Ltd
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Publication of CN108058083A publication Critical patent/CN108058083A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/623—Portable devices, e.g. mobile telephones, cameras or pacemakers
    • H01M10/6235—Power tools
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6566—Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/256—Carrying devices, e.g. belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses an electric tool, comprising: the tool host comprises a tool accessory for realizing the function of a tool and a main motor for driving the tool accessory to move; the battery pack comprises a shell and a plurality of battery cells accommodated in the shell, wherein the shell comprises an air inlet and an air outlet; wherein the tool host includes: a first fan for generating an air flow; the tool host is provided with: and the tool air duct can communicate the air outlet of the battery pack with the first fan when the battery pack is combined to the tool host machine so that heat from the battery pack is dissipated after flowing in the tool air duct under the action of the first fan. The electric tool disclosed by the invention has better heat dissipation performance.

Description

Battery pack and electric tool
Technical Field
The present invention relates to a battery pack and an electric power tool, and more particularly, to a cooling technique for a battery pack and an electric power tool.
Background
The battery pack is adopted as an electric energy source for the existing electric tool, the battery pack and the electric tool generate heat in the working process to cause overhigh temperature, the service performance of the battery and the electric tool is finally influenced, and the potential safety hazard is even brought under the severe working condition.
Therefore, heat dissipation of the battery pack and the electric power tool needs to be considered in the design of the battery pack and the electric power tool.
Disclosure of Invention
In order to achieve the above object, the present invention adopts the following technical solutions:
a power tool, comprising: the tool main machine comprises a tool accessory for realizing the function of the tool and a main motor for driving the tool accessory to move; the battery pack comprises a shell and a plurality of battery cells accommodated in the shell, wherein the shell comprises an air inlet and an air outlet; wherein, the instrument host computer includes: a first fan for generating an air flow; the tool host is provided with: and the tool air duct can communicate the air outlet of the battery pack with the first fan when the battery pack is combined to the tool host machine so that heat from the battery pack can be dissipated after flowing in the tool air duct under the action of the first fan.
Further, the first fan is driven by the main motor.
Further, the first fan is a centrifugal fan.
Further, the tool host includes: a tool housing defining a cavity for at least the flow of air therethrough; the tool housing includes: the tool shell air inlet is positioned on one side of the tool shell close to the battery pack; the tool shell air outlet is positioned at the other side of the tool shell close to the tool accessory; external air flows in the cavity from the air inlet of the tool shell and then flows out from the air outlet of the tool shell to take away heat generated inside the tool host.
Further, the tool air duct is spaced relative to a cavity formed by the tool housing.
Further, still include: and the circuit board is positioned in a cavity formed by the tool shell.
Further, still include: a second fan for exhausting the air flow out of the tool housing; the second fan is coaxial with the main motor so that the main motor drives the second fan to rotate.
Another power tool, comprising: the tool main machine comprises a tool accessory for realizing the function of the tool and a main motor for driving the tool accessory to move; the battery pack comprises a shell and a plurality of battery cells accommodated in the shell; the backpack equipment is used for being worn on a human body; the tool host is connected to the bearing equipment, the battery pack is detachably connected to the bearing equipment, and an air inlet and an air outlet are formed in the shell of the battery pack; the backpack apparatus includes: and the equipment air duct can be communicated with an air outlet of the battery pack to dissipate heat of the battery cell in the battery pack when the battery pack is combined to the backpack equipment.
Further, the backpack apparatus includes: one end of the air guide cover is connected with the equipment air channel, and the other end of the air guide cover is provided with a guide air outlet for guiding air flow to turn.
Further, still include: the fan is arranged in the air guide cover.
When the battery pack is combined with the tool host machine to work, the tool air channel is communicated with the air outlet of the battery pack so that heat generated by the battery pack is dissipated out through the tool air channel, and the heat dissipation efficiency of the battery pack and the tool host machine is improved.
Drawings
Fig. 1 shows a battery pack as an example;
FIG. 2 is a block diagram of another perspective of the battery pack of FIG. 1;
fig. 3 is an exploded view of the battery pack shown in fig. 1;
fig. 4 is a sectional view of the battery pack shown in fig. 1;
FIG. 5 is a schematic airflow direction diagram of the battery pack of FIG. 1;
FIG. 6 shows an angle grinder as an example;
FIG. 7 is an internal block diagram of the angle grinder of FIG. 6;
FIG. 8 is an exploded view of the angle grinder of FIG. 6;
FIG. 9 is a schematic view of the air flow direction of the angle grinder of FIG. 6;
FIG. 10 shows another example angle grinder;
FIG. 11 is an internal block diagram of the angle grinder of FIG. 10;
FIG. 12 is a schematic view of the air flow direction of the angle grinder of FIG. 10;
figure 13 shows an example of an electric drill;
figure 14 is a schematic view of the internal structure of the drill of figure 13 from one perspective;
figure 15 is an exploded view of the power drill of figure 13;
figure 16 is a schematic view of the airflow direction of the power drill of figure 13;
figure 17 shows a blower as an example;
fig. 18 is a structural view of the battery pack shown in fig. 17;
fig. 19 is a structural view of the battery pack shown in fig. 17 from another perspective;
figure 20 is an exploded view of the blower of figure 17;
figure 21 is an exploded view from another perspective of the blower of figure 17.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Referring to the battery pack 120 shown in fig. 1 to 5, the battery pack 120 is detachably connected to the power tool to supply power to the power tool. The battery pack 120 includes a plurality of battery cells 121, and each battery cell 121 includes a cell body 121a for storing chemical substances for generating electric energy and a cell electrode 121b for outputting or inputting electric energy to the battery cell 121. Specifically, the battery cell body 121a is a revolving body using the central axis 101 as an axis, the length direction of the battery cell body 121a is parallel to the central axis 101, and a plurality of battery cell bodies 121a are arranged in parallel. The cell electrodes 121b are provided at both ends of the cell body 121a in the direction of the central axis 101. Specifically, the cell body 121a is substantially a cylinder, and a gap is formed between the plurality of cell bodies 121 a.
The battery pack 120 further includes a housing 123 for accommodating the battery cell 121 and a holder 124 for supporting the battery cell 121. The brackets 124 are provided at both ends of the cell body 121a in the direction of the central axis 101.
Referring to fig. 3 to 5, a sealant (not shown) is filled between the holder 124 and the case 123 so that the cell electrode 121b is sealed in the sealed space 102 formed by the holder 124, the case 123 and the sealant. The cell body 121a is partially located outside the sealed space 102. It should be noted that the sealant herein includes a sealant or a sealing element, such as a gasket, which is disposed between the bracket 124 and the housing 123 and can form a sealing space together with the bracket 124 and the housing 123.
The housing 123 includes an end cap 125 disposed at one end in the direction of the central axis 101 where the battery cell 121 is located, and the end cap 125 and the bracket 124 form a sealed space. Specifically, the cell electrode includes a cell positive electrode and a cell negative electrode, end caps 125 are respectively disposed at two ends of the cell positive electrode and the cell negative electrode along the central axis 101, and a sealant is filled between the end caps 125 and the support 124 so that the cell electrode is sealed in the sealed space 102 sealed by the end caps 125, the support 124 and the sealant.
The battery pack further includes a connecting piece 126 for connecting several cells in series or in parallel, and a portion of the connecting piece 126 is disposed in the sealed space 102. Like this, through setting up electric core electrode 121b and some connection piece 126 in the battery package in sealed space 102 by end cover 125, support 124 and sealed glue constitution for outside dust and water are difficult for advancing electric core electrode, reduce electric core electrode's short circuit risk, make things convenient for the assembly in the battery package production process when effectively improving battery package dustproof and waterproof effect.
The end cap 125 is provided with a vent hole 125a capable of communicating with the gap 121c between the cell bodies 121a, and an air duct for convection with external air is formed through the gap 121c and the vent hole 125a to further facilitate heat dissipation of the cell. More specifically, a dust screen may be provided on the air vent 125a to prevent dust from entering.
The casing 123 is further provided with an air inlet 123a and an air outlet 123b, so that the air flow passing through them passes through the portion of the cell body located outside the sealed space 102. As shown in fig. 3 and 5, the cell body 121a is substantially cylindrical, and the air flow flowing from the air inlet 123a and flowing from the air outlet 123b is substantially perpendicular to the cell body 121 a. In the process of charging and discharging, chemical substances in the battery cell body react with each other to generate heat, an air duct capable of supplying air flow is formed between the outer surface of the battery cell body 121a and the support 124 in the shell of the battery pack, the external cold air flow flows into the shell 123 through the air inlet 123a, flows on the outer surfaces of the battery cell bodies 121a along the arrow 103 in fig. 5 and flows out through the air outlet 123b, and therefore the heat of the battery cell body 121a is taken away to dissipate heat of the battery pack.
In order to enhance the heat dissipation effect of the battery pack, a fan for generating air flow may be further disposed between the inlet port 123a and the outlet port 123b, and a battery pack motor is disposed in the housing 123 for driving the fan to rotate.
Referring to fig. 6 to 9, the angle grinder 100 includes a tool main body 110 and a battery pack 120 detachably coupled to the tool main body, and the battery pack 120 may be a battery pack according to the above-mentioned embodiments, or other battery packs capable of being coupled to the angle grinder 100 to supply power to the angle grinder.
The tool main body 110 includes a tool accessory for implementing a tool function and a main motor for driving the tool accessory. The sanding disc 111 serves as a tool attachment for the angle grinder 100 and performs a sanding function under the drive of the main motor 112.
Referring to fig. 6 to 8, the tool main body 110 includes a polishing disk 111 as a tool attachment, a main motor 112, a tool housing 113, a tool duct 114, a first fan 115, and a second fan 116. For convenience of description, the up-down direction and the left-right direction in the following description refer to the directions shown in fig. 5.
The tool housing 113 includes a tool housing air inlet 113a and a tool housing air outlet 113b for allowing air flow in and out. Specifically, the tool housing air inlet 113a is disposed at an end of the tool housing 113 near the battery pack 120, and the tool housing air outlet 113b is disposed at an end of the tool housing 113 near the polishing disk 111, and more specifically, the tool housing air outlet 113b is disposed between the second fan 116 and the polishing disk 111.
The main motor 112, which is used to drive the rotation of the grinding disk to perform the grinding function of the angle grinder 100, is disposed within the tool housing 113. In particular, the main motor 112 may be a brushless motor located within the tool housing 113 proximate to the polishing disc 111.
A second fan 116 for exhausting air flow out of the tool housing 113 is provided between the main motor 112 and the grinding disk 111 coaxially with the motor shaft of the main motor 112, i.e., rotating synchronously with the main motor 112. Obviously, the second fan 116 may also be a part of the main motor 112.
The first fan 115 is disposed between the tool duct 114 and the main motor 112, is coaxial with a motor shaft of the main motor 112, and rotates with the rotation of the main motor 112 to generate an air flow. More specifically, the first fan 115 is disposed at the upper end of the tool duct 114 to generate an air flow to accelerate the flow of the hot air from the battery pack 110 in the direction indicated by the arrow 103 c. Specifically, the first fan 115 is a centrifugal fan.
The tool duct 114 is disposed in the tool housing 113 and is capable of communicating the air outlet 123b of the battery pack 120 with the first fan 115 when the battery pack 120 is coupled to the tool main unit. Specifically, the tool air duct 114 is arranged at the left side position in the tool housing 113, the upper end and the lower end of the tool air duct 114 are both provided with openings with large cross-sectional areas, and the middle section is a straight cylinder with a small cross-sectional area, so that the air flow flowing into or out of the tool air duct is increased, the flowing speed of the air flow is increased, the heat dissipation efficiency of the angle grinder is improved, and meanwhile, the tool air duct can also provide enough space for placing a circuit board 117 for driving a motor and a switch 118 for controlling the operation of the angle grinder.
The battery pack 110 is connected to the tool body 120, and the user activates the switch 118, so that the battery pack 110 powers the tool body 120 so that the angle grinder 100 performs an operation of grinding a target workpiece. The battery pack 110 generates heat during operation, and all electronic components on the circuit board of the tool host 120 generate heat during operation and motor rotation, so that the heat dissipation of the battery pack 110 and the tool host 120 needs to be accelerated in order to avoid potential safety hazards caused by temperature rise inside the battery pack 110 and the tool host 120 due to excessive heat.
Referring to fig. 6, the tool case 113 is provided at a lower end thereof with a tool case inlet 113a for allowing an external air flow to flow in, and at an upper end thereof with a tool case outlet 113b for allowing an air flow to flow out. Specifically, the tool housing air inlet 113a is disposed on the front side of the tool housing 113 corresponding to the circuit board 117a for electrically connecting with the connection terminal of the battery pack 110, so as to ensure the heat dissipation area and the heat dissipation efficiency of the circuit board 118a as much as possible.
The external air enters the tool housing 113 through the tool housing air inlet 113a, sequentially flows through the circuit boards 117a and 117b and the main motor 112 in the direction indicated by the arrow 104, and then flows out of the tool housing 113 through the tool housing air outlet 113b under the action of the second fan 116, so as to take away heat generated by the internal components such as the circuit boards 117a and 117b and the main motor 112 in the tool host 120, and dissipate heat for the tool host 120.
Referring to fig. 9, the main motor 112 rotates to drive the first fan 115 to rotate, and by means of the rotation of the first fan 115, the external air enters from the air inlet 123a and flows in the battery pack along the direction indicated by the arrow 105, and then flows out through the air outlet 123b and flows in the tool air duct 114 along the direction indicated by the arrow 103, and finally the air flow is discharged out of the tool housing 11 under the action of the first fan 115.
As shown in fig. 8, the electric drill 120 further includes an air guiding cover 119, the air guiding cover 119 has a receiving groove for receiving the first fan 115, that is, the air guiding cover 119 is sleeved around the first fan 115, one end of the air guiding cover 119 is connected to the upper end opening of the tool air duct 114, and two air guiding cover air outlets 119a for guiding the air flow are radially disposed on the air guiding cover 119. Thus, the airflow flowing in the tool air duct 114 in the direction indicated by the arrow 103 is guided by the wind scooper 119 and then discharged through the wind scooper outlet 119a under the action of the first fan 115.
The fixing members 119c are respectively provided on the left side surface and the right side surface of the air guiding cover 119, so that the air guiding cover 119 is fixed in the tool case 113 and other air flows in the tool case 113 can freely flow. Other air flows herein refer to air flows that do not come from the battery pack.
Considering the assembly requirement, the wind scooper 119 may be divided into two wind scoopers, one wind scooper is integrally formed with the tool wind channel, and the other wind scooper may be directly connected with the tool wind channel in a snap-fit or other fixed connection manner to form a receiving groove for receiving the first fan 115.
In order to facilitate the air flow to exit from the tool casing 113, a casing outlet (not shown) is provided at a position of the tool casing 113 corresponding to the wind scooper outlet 119 a. Thus, the main motor 112 rotates to drive the first fan 115 coaxial with the main motor to rotate, the airflow flowing in through the air inlet 123a flows through the surface of the battery cell body along the arrow 105 under the action of the first fan 115, takes away heat in the battery pack, flows out of the battery pack 120, enters the tool air duct 114, flows along the direction indicated by the arrow 103, and flows out of the tool casing 113 through the air outlet 119a of the air guide cover and the air outlet of the casing, so that heat dissipation is realized.
By adopting the scheme, the airflow from the battery pack is separated from the airflow in the tool main unit, so that the heat generated by the battery pack 110 directly flows out of the tool shell 113 through the tool air duct 114 under the action of the first fan 115, and the influence of the heat of the battery pack 110 on other devices such as a circuit board in the tool shell 113 is avoided while the heat dissipation of the angle grinder 100 is accelerated.
Referring to fig. 10-12, another angle grinder 200 includes: a battery pack 210 and a tool main unit 220, the battery pack 210 being detachably connected to the tool main unit 220. Specifically, the battery pack 210 may be the battery pack 110 shown in fig. 1 to 5, or may be a battery pack of other structure, as long as the air outlet of the battery pack 210 corresponds to the tool host.
The main structure of the tool main unit 220 is substantially the same as that of the above-described embodiment, and includes a tool housing 221, a first circuit board 222a, a second circuit board 222b, a switch 223, a main motor 224, a first fan 225, and a second fan 226.
As shown in fig. 11, the first circuit board 222a, the second circuit board 222b, the switch 223, the main motor 224, and the second fan 226 are accommodated in the tool housing 221 in this order from bottom to top. And will not be described in detail herein.
The difference from the above-described solution is that the first fan 225 for generating an air current is disposed at the lower end of the tool case 221, and in particular, the first fan 225 is disposed at a position opposite to the air outlet of the battery pack 210 at the lower end of the tool case.
The tool body further comprises an auxiliary motor (not shown) having an output shaft coaxially connected to the first fan 225 for driving the first fan 225 in rotation. It is possible that the auxiliary motor is integrated with the first fan 225. The battery pack 210 supplies power to the auxiliary motor to drive the first fan 225 to rotate.
The tool housing 221 includes a tool housing inlet 221a, a first outlet 221b, and a second outlet 221c for allowing an external air flow to flow in. The tool housing air inlet 221a is disposed at a front side and/or a rear side of the lower end of the tool housing corresponding to the first circuit board 222 a. The first air outlet 221b is provided at the upper end of the tool case 221 between a sanding member as an accessory of the tool and the first fan 225. The tool housing inlet 221a and the first outlet 221b form a first air flow path, so that the external air flow flowing in from the tool housing inlet 221a is discharged through the first outlet 221b after flowing through the tool housing.
A second air outlet 221c is formed at a lower end of the tool case 221 at a position corresponding to the first fan 225. The second air outlet 221c is used for guiding out the air flow flowing in through the air inlet of the battery pack. The air inlet of the battery pack 210, the air outlet of the battery pack 210 and the second air outlet 221 of the tool housing form a second air flow channel. The second air outlet 221 is disposed opposite to the air outlet of the battery pack 210. The external air flow flowing in from the air inlet of the battery pack 221 circulates in the battery pack case and flows out through the second air outlet 221c under the action of the first fan 225.
Referring to fig. 12, when the angle grinder 200 works, external air flows into the tool housing through the tool housing air inlet 221a, flows in the tool housing along the direction indicated by the arrow 201a, sequentially carries away heat generated by the work of the circuit board 222a, the circuit board 222b, the switch 223 and the main motor 224, and finally flows out through the first air outlet 221b to meet the heat dissipation requirement of the tool host. The heat generated by the operation of the battery pack flows in the battery pack housing along the direction indicated by the arrow 201b under the action of the first fan 225, and then flows out through the second air outlet 221 c.
By adopting the scheme, the first air flow channel and the second air flow channel are independent, so that the influence of heat generated by the battery pack 210 on devices such as a circuit board, a switch and the like in the tool main body 220 is avoided, and the reliability is high; with first fan 225 setting in the top of battery package air-out mouth, accelerated the inside air current circulation of battery package, further improve the radiating efficiency of battery package, and then improve the radiating efficiency of whole angle grinder 200.
Obviously, the first fan 225 may also be disposed between the air inlet and the air outlet of the battery pack 210. A battery pack motor is provided in the battery pack 210 to drive the first fan to rotate. Specifically, the first fan is a centrifugal fan.
Referring to fig. 13, a power drill 300 is shown including a battery pack 310 and a tool body 320.
The battery pack 310 is detachably coupled to the tool body 320 to supply power to the tool body 320. Specifically, the battery pack 210 may be the battery pack 110 shown in fig. 1 to 5, or may be a battery pack of other structure, as long as the air outlet of the battery pack 310 corresponds to the tool host.
The tool body 320 includes a drill bit 321 for acting on a target workpiece to perform a drill function, a tool housing 322, a main motor 332, a first circuit board 331a, a second circuit board 331b, a trigger switch 341, and a first fan 351.
The tool housing 322 includes a receiving portion 324 extending in the rotational axis direction of the main motor 332, a grip portion 325 for a user to grip substantially perpendicular to the receiving portion, and a coupling portion 326 for coupling to the battery pack 310.
As shown in fig. 14, the second circuit board 331b is disposed in the holding portion 324, and a trigger switch 341 is disposed at a position convenient for a user to hold at an end of the holding portion 324 close to the accommodating portion 324. The trigger switch 341 is used as a start and speed control switch of the electric drill, and is used for conducting the electrical connection between the battery pack 310 and the tool body 320, so that the electric drill works according to an operation instruction input by a user.
The tool host 320 also includes a tool air chute 352 for airflow therethrough. Specifically, the tool air duct 352 is disposed on a side of the grip portion 324 away from the trigger, and the tool air duct 352 extends along a length direction of the grip portion 324 to form a relatively independent circulation space. The opening of the tool wind channel 352 near one end of the battery pack 310 is opposite to the wind outlet of the battery pack 310, and can at least communicate with the wind outlet of the battery pack 310 when the battery pack 310 is combined with the tool host 320.
Referring to fig. 14 and 15, the main motor 332 and the first fan 351 are disposed in the receiving portion 324 in a length direction of the receiving portion 324, and the main motor 324 is located between the drill 321 and the first fan 351. The first fan 351 is disposed on a side of the accommodating portion away from the drill 321, and is connected to the main motor 324 via a rotating shaft, and the battery pack 310 supplies power to the main motor 324 to drive the first fan 351 to rotate.
The first outlet 324a is provided at both sides of the accommodating portion 324 in the radial direction of the first fan 351. In order to ensure that the airflow from the outlet does not affect the operation of the user, the first outlet 324a is disposed on the front and rear sides of the accommodating portion 324. The receiving portion 324 is also provided with air inlets 324d at both sides of the main motor 332. In the left-right direction, the air inlet 324d is located between the drill and the first fan 351; the intake vent 324d is disposed opposite the main motor in the front-rear direction to allow an external air flow into the receiving portion 324 through the main motor 332.
The tool mainframe further comprises a wind scooper 361 for directing the airflow. The wind scooper 361 is provided at an end 324c of the accommodating portion 324 at the end distant from the drill 321. Specifically, the air guiding cover 361 has an accommodating groove, so that a certain distance is formed between the end surface 361a of the air guiding cover 361 and the plane of the end portion 324c of the accommodating portion in the axial direction of the rotating shaft of the main motor 332, so that the air flow can be facilitated. The air guiding cover 361 further forms a second air outlet 361b, and when the air guiding cover 361 is coupled to the accommodating portion 324 along the axial direction of the rotating shaft, the second air outlet 361b and the first air outlet 324a are disposed correspondingly to allow the air flow to flow out.
Specifically, the first fan 351 is a double-sided centrifugal fan. The main motor 332 operates to rotate the first fan 351, and a negative pressure is generated at both axial sides of the first fan 351. Referring to fig. 16, the negative pressure generated by the first fan 351 near the main motor 332 causes the airflow flowing into the accommodating portion 324 through the inlet 324d to flow through the main motor 332 in the direction indicated by the arrow 301a, and then flows out of the tool housing 332 through the first outlet 324a and the second outlet 361b in the direction indicated by the arrow 301 b. Referring to fig. 14 and 16, the negative pressure generated by the first fan 351 at the side away from the main motor 332 causes the airflow from the battery pack 310 to flow into the tool air duct 352, flow through the tool air duct 352 in the direction of arrow 301c, and flow out of the tool housing 332 through the first air outlet 324a and the second air outlet 361b in the direction of arrow 301 b.
Thus, two relatively independent air ducts are formed in the electric drill 300, the influence of hot air flow inside the battery pack 310 on devices such as a circuit board and a trigger switch in the tool main body 320 is reduced, and the reliability is high. The setting of two-sided centrifugal fan is when accelerating the circulation of air current along two independent wind channels, effectively sparingly holds the inner space in chamber for electric drill 300 has also guaranteed the compactness of complete machine structure when improving heat dispersion.
Referring to figure 17, a blower 400 is shown, comprising a battery pack 410, a tool host 420 and a harness 430. The tool host 420 is connected to the piggyback equipment 430, and the battery pack 410 is detachably connected to the piggyback equipment 430 for supplying power to the tool host 420.
The battery pack 410 shown in fig. 18 to 19 includes a battery pack case 411 and several battery cells accommodated in the battery pack case 411. To meet the high power operating requirements of blower 400, battery pack 410 has an output voltage of at least 56V. Because the battery pack 410 has a larger output voltage, the battery pack 410 generates a larger amount of heat when supplying power, and the air inlet 411a and the air outlet 411b are arranged on the battery pack shell 411 to form an air flow channel for dissipating heat of the battery pack 410.
Specifically, a plurality of air inlets 411a are disposed on a side of the battery pack case 411 away from the human body, for allowing external air to flow in. An air outlet 411b is provided at a side where the battery pack case 411 is combined with the backpack device 430. External air flow enters the interior of the battery pack shell 411 through the air inlet 411a and then flows out through the air outlet 411b so as to take away the internal heat of the battery pack 411 and cool the battery pack. To ensure uniform heat dissipation of the battery pack 410, the heat dissipation areas of the inlet opening 411a and the outlet opening 411b are substantially the same.
The tool main body 420 includes a tool accessory for implementing a blowing function of the blower 400 and a main motor (not shown) for driving the tool accessory to move. Specifically, the tool accessory is an axial fan (not shown), and the primary motor is a motor that drives the axial fan to rotate so that the axial fan generates an air flow. The main structure of the tool main unit 420 is substantially the same as that of the general hair dryer 400, and thus, the detailed description thereof is omitted.
The harness 430 includes a harness wind tunnel 431 and a fan 432. The fan 432 is used for generating air flow, and the equipment air duct 431 can communicate the battery pack air outlet 411b and the fan 432 when the battery pack 410 is combined to the bearing equipment 430, so that the fan 432 generates air flow to dissipate heat of the battery cells in the battery pack 410. Possibly, the fan 432 is driven by a motor of the harness 430, which is powered by the battery pack 410. The carrying equipment 430 also includes a controller that controls the motor driven fan of the carrying equipment when the temperature of the battery pack is greater than a preset value.
As shown in fig. 20-21, the harness 430 further includes a harness 433, a first housing 434, and a second housing 435. The first shell 434 is used for fixing the shoulder strap 433, the second shell 434 is used for placing the battery pack 410, and the first shell 434 and the second shell 435 are fixedly connected to form the whole outer shell of the backpack device 430.
The second housing 434 includes a plugging portion 436 for plugging the battery pack 410, the plugging portion 436 forms a plugging surface along which the battery pack 410 is coupled to the carrying device 430, and the plugging portion 436 is disposed at a device air outlet 434 corresponding to the battery pack air outlet 410b, so that the air flow of the battery pack 410 flows in. The fan 432 is provided between the first housing 434 and the second housing 435 and is rotatable about its central axis 432 a. The central axis 432a is perpendicular to the insertion and extraction plane. Specifically, the equipment air duct 431 is disposed opposite to the battery pack air outlet 411a and extends along the direction of the central axis 432a, so that the battery pack 410 is communicated with the battery pack air outlet 410b when being combined with the carrying equipment 430 to dissipate heat of the battery cells in the battery pack.
The harness 430 also includes a wind scooper 437 for directing the flow of air. The wind scooper 437 has a receiving cavity for receiving the fan 432, that is, the wind scooper 437 is sleeved outside the fan. One end of the air inlet of the air guide cover 437 is connected with the equipment air duct 431, and the other end is provided with a guide air outlet 437a for guiding air flow to turn.
Referring to fig. 20 and 21, the battery pack 410 supplies power to the tool host 430, external air flows into the battery pack 410 through the air inlet 411a, flows out of the battery cell in the battery pack through the air outlet 411b, flows into the air guiding cover 437 in the direction shown by the arrow 401b under the action of the fan 432, and flows out of the air guiding cover 437 in the direction shown by the arrow 401c after being reversed by the air guiding cover 437. The arrangement of the fan 432 and the wind scooper 437 accelerates the speed of the external cooler airflow flowing through the battery pack 410, and further more carries away the heat of the electric core, thereby improving the heat dissipation efficiency of the battery pack, meanwhile, the airflow is discharged through the guide air outlet 437 arranged on the side surface of the fan 432, the influence of the hotter airflow on the user is avoided while the influence of the hotter airflow on other devices in the tool housing is avoided, and the user wears the backpack device 430 for more comfortable operation.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (6)

1. A power tool, comprising:
the tool host comprises a tool accessory for realizing the function of a tool and a main motor for driving the tool accessory to move;
the battery pack comprises a shell and a plurality of battery cells accommodated in the shell, wherein the shell comprises an air inlet and an air outlet;
wherein the tool host includes:
a first fan for generating an air flow;
the tool host is provided with:
the tool air channel can be communicated with the air outlet of the battery pack and the first fan when the battery pack is combined to the tool host machine so that heat from the battery pack can be dissipated after flowing in the tool air channel under the action of the first fan;
the electric tool also comprises an air guide cover, and the air guide cover is connected with the tool air channel;
the air guide cover is sleeved on the circumference of the first fan, and an air guide cover air outlet used for guiding the flow direction of air flow is arranged in the radial direction of the air guide cover;
the tool host includes: a tool housing defining a cavity for at least the flow of air therethrough;
the tool housing includes:
the tool shell air inlet is positioned on one side, close to the battery pack, of the tool shell;
a tool housing air outlet located on the other side of the tool housing proximate the tool accessory;
external airflow flows into the cavity from the air inlet of the tool shell and flows out from the air outlet of the tool shell to take away heat generated inside the tool host;
the tool air duct is spaced relative to the cavity formed by the tool housing.
2. The power tool of claim 1,
the first fan is driven by the main motor.
3. The power tool of claim 1,
the first fan is a centrifugal fan.
4. The power tool of claim 1,
further comprising:
a circuit board located within the cavity formed by the tool housing.
5. The power tool of claim 1,
further comprising:
a second fan for exhausting an air flow out of the tool housing;
the second fan is coaxial with the main motor so that the main motor drives the second fan to rotate.
6. A power tool, comprising:
the tool host comprises a tool accessory for realizing the function of a tool and a main motor for driving the tool accessory to move;
the battery pack comprises a shell and a plurality of battery cells accommodated in the shell;
the backpack equipment is used for being worn on a human body;
the tool host is connected to the bearing equipment, the battery pack is detachably connected to the bearing equipment, and an air inlet and an air outlet are formed in the shell of the battery pack;
the backpack apparatus includes: the equipment air duct can be communicated with the battery pack air outlet to dissipate heat of the battery cell in the battery pack when the battery pack is combined to the bearing equipment; one end of the air guide cover is connected with the equipment air channel, and the other end of the air guide cover is provided with a guide air outlet for guiding air flow to turn;
the fan is arranged in the air guide cover; the fan can rotate around the central axis of the fan, and the central axis is perpendicular to the plugging surface; the equipment air channel is arranged relative to the air outlet of the battery pack and extends along the direction of the central axis; the guide air outlet is positioned on the side surface of the fan.
CN201710982520.0A 2016-11-07 2017-10-20 Battery pack and electric tool Active CN108058083B (en)

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CN108058083A (en) 2018-05-22

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